Research Article

Morphophysiological and agronomic performance of 42 common bean genotypes grown hydroponically under phosphorus deficiency

Published: April 30, 2021
Genet. Mol. Res. 20(2): GMR18753 DOI: https://doi.org/10.4238/gmr18753
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Abstract

An inadequate supply of phosphorus (P) is one of the most limiting factors for plant nutrition, resulting in morphophysiological adjustments and reduced production. We evaluated 42 common bean germplasm bank accesses of the Instituto Agronômico Brazil that are divergent in root traits, using a hydroponic system to determine their performance under P deficiency. The plants were grown with a low P concentration (4.00 mg L-1) in a completely randomized experimental design, with three replications. Evaluations for shoot, root system and grain production traits were carried out, followed by individual analyses of variance, Scott-Knott mean test, Pearson correlation, and GGE-biplot analysis. Leaf chemical analysis showed a mean content of 2.20 g kg-1 of P, a value below the recommended range, as expected.  Analyses of variance showed a significant effect on most of the traits evaluated; the coefficients ranged from 7.1 to 19.8%. The genotypes were clustered for most of the variables based on the Scott-Knott mean test. Two genotypes (G 2333 and Rubi) stood out as the highest yielding, with a greater relative chlorophyll index and better development of the root system. A significant correlation was found between the the root traits length, surface area, and volume with production components. Based on GGE-biplot analysis, 12 genotypes were selected that simultaneously performed better for grain yield and root system.

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